Effect of stress-dependent permeability on gas production and well testing
Conference
·
OSTI ID:5373430
The effect of stress-dependent permeability on gas production and well testing in tight gas sands was studied by using a modified pseudopressure that included the stress dependence. Since tight gas permeability is due to flow through microcracks, average stress-dependent permeabilities were found as an average over all crack orientations in a nonuniform stress field, with a horizontal stress only 0.6 times the vertical one. Initial in-situ permeabilities are found to be 2 to 5 times the values obtained from uniformly restressed cores. Stress dependence decreases initial gas production by roughly 30% with the loss increasing with reservoir depletion. Buildup tests yield reliable reservoir properties, but drawdown tests do not. Type curves using differences of pseudopressures which do not include stress-dependence are distorted by stress-dependence and can provide less reliable results. 11 figures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5373430
- Report Number(s):
- SAND-82-1637C; CONF-820927-2; ON: DE82018751
- Country of Publication:
- United States
- Language:
- English
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